Kamaaluddin wa Tamaamun Ni’ma Vol. 2

Now it is about 12 centuries passed from Imam Mahdi's hidden life, and the bothering time of his hidden life will continue up to his reappearance. According to imam Ridha (as), Imam's reappearance will be extended to the day of Doom, no one knows this but God, it is hard to people and it will happen suddenly. Therefore, any investigation to find the exact time of his reappearance is fruitless and our duty is to wait. The meaning of "waiting for" is to desire his reappearance desperately and looking forward to his reappearance; this waiting results from faith and it is rewarded.